We were receiving the TNS-12542 error message intermittently from an application server when attempting to connect to the DB.

Fixing the ORA-12542 on Windows. The error "ORA-12542: TNS:address already in use" is rare on UNIX but very common on Windows crapware and /net platforms, and this.

In this article you will find a perfect way to uninstall a stand-alone instance of SQL Server 2014.

[The ORA-12542 TNS address in use error] is caused due to the fact that the free ports in the windows client has been exhausted and it is trying to make use of a port which is in TIME_WAIT state which gives the error TNS-12542: Address already.

The docs note this on the ORA-12542 error: ORA-12542: TNS:address already in use. Cause: Specified listener address is already being used.

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